Portion of a back face of a golf club head



FIG. 1 is a rear perspective view of the first embodiment of the portion of a back face of a golf club head of the present invention;

FIG. 2 is a rear elevational view thereof;

FIG. 3 is a rear perspective view of a second embodiment of the portion of a back face of a golf club head; and,

FIG. 4 is a rear elevational view of the second embodiment.

The stipple shading on FIGS. 3 and 4 indicate the color black.

The broken line showing of a golf club head is for illustrative purposes only and forms no part of the claimed design. 

The ornamental design for a portion of a back face of a golf club head, as shown and described. 